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Function: Read from standard input and write to both standard output and files
Usage: tee [OPTION]... [FILE]...
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Function: report file system disk space usage
Usage: df [OPTION]... [FILE]...
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Function: identify processes using files or sockets
Usage: fuser [-a|-s|-c] [-4|-6] [-n space ] [-k [-i] [-signal ] ] [-muvf] name ...
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Function: concatenate and print files in reverse
Usage: tac [OPTION]... [FILE]...
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Function: display a line of text
Usage: echo [SHORT-OPTION]... [STRING]...
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Function: sort lines of text files
Usage: sort [OPTION]... --files0-from=F
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Function: initialize a terminal or query terminfo database
Usage: tput [-Ttype] capname [parms ... ]
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Function: print or set the system date and time
Usage: date [OPTION]... [+FORMAT]
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Function: convert and copy a file
Usage: dd [OPERAND]...
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Function: send a message to another user
Usage: write user [ttyname]
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Function: change file owner and group
Usage: chown [OPTION]... --reference=RFILE FILE...
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Function: move (rename) files
Usage: mv [OPTION]... [-T] SOURCE DEST
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Function: print user's login name
Usage: logname [OPTION]
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Function: check file types and compare values
Usage: test EXPRESSION
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Function: format and display the on-line manual pages
Usage: man [-acdDfFhkKtvVwW] [--path] [-m system] [-p string] [-C config_file] [-M pathlist] [-P pager] [-B browser] [-H htmlpager] [-S section_list]